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Answer variants:
5.143
4.143
7.143
6.143
In \(\triangle ABC\), \(D\) and \(E\) are points of the sides \(AB\) and \(AC\), respectively. If \(DE \parallel BC\), \(\frac{AD}{DB} = \frac{2}{5}\) and \(AC = 8.6 \ cm\), then find \(EC\).
The value of \(EC\) is \(cm\).
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